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notes.md

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Implementation notes:

  • 5 helper functions in model.h - 1 factory method createNullNode()

  • 1 extra visitor struct in model.h

  • 2 extra enum classes - ConstType and Comparable

  • Model class uses a stack to keep track of current open containers

  • Default constructor for ModelNode sets the value to NullType{}

  • Added assignment operator to JSONState to allow assignment of currOpenContainer in Model to the top of the states stack

  • Model holds a stack of ModelNodes that is continuously updated during parsing

  • Added enum class Exact to differentiate between all the types that ModelNode can hold

  • Added method getConstType() to Model to find the specific constant type the underlying ModelNode at any time

  • Added helper method createNode that updates a data member tempNode in Model since its used for openContainer, addKeyVal, and addItems

  • Note that willParse in Parser.parse() takes care of the opening curly brace in any JSON file

  • ModelQuery holds a tempNode which is a selected and/or filtered ModelNode object to pass into sum/get/count

  • getContainerType() uses the visitor pattern with std::visit to determine the object type

  • Assumption: when writing get(), helper fcn toString() and constNodeToString() assumes that if a map is printed, it only has key value pairs and no nested objects

  • Error handling for sum - checks to see if ModelQuery::tempNode is ListNode type - if not, throws std::invalid_argument

    • Also checks to ensure all elements are numerics - throws bad variant access error if not

  • Error handling for constNodeToString - throws std::invalid_argument if list/object type passed in